Ce travail a été soutenu par la National Multiple Sclerosis Society (AT 3021-A1 / T pour AEC) et l&#39;Université du Texas à San Antonio.

Préparation des réactifs Préparez le bouillon isotonique Percoll (SIP), 4 ml par le cerveau, en mélangeant 9 volumes de Percoll avec une partie de HBSS 10X sans Ca + + et Mg + +. Préparer SIP à 70% en 1X HBSS sans Ca + + et Mg + +, 2 ml par le cerveau dispensés dans un tube de 15 ml en polypropylène coniques. Note: Il est recommandé que Percoll doit être utilisée à température ambiante, s&#39;il est utilisé à froid, les cellules ont tendance à s&#39;agglutiner et à la séparation des cellules est moins efficace. Collection de tissus et d&#39;homogénéisation Anesthetize souris et perfuser à travers le ventricule gauche, avec glacée HBSS 1X. Disséquer le cerveau et la moelle épinière et de maintenir en RPMI sans rouge de phénol jusqu&#39;à ce que toutes les souris sont sacrifiées. Placer les tissus en 7 ou 15 ml Dounce homogénéisateur contenant 3 ml de RPMI, doucement prendre une suspension de cellules avec un pilon lâches (Une taille) suivie par un pilon Tigh-montage (taille B) de continuer à dissocier les tissus. Compléter le volume de la suspension cellulaire à 7 ml avec du RPMI. Dégradé mis en place Ajouter 3 ml de SIP à la suspension cellulaire pour faire un SIP finale de 30% Lentement couche de la suspension cellulaire 10 ml au sommet de la SIP à 70%. C&#39;est l&#39;étape la plus critique de la procédure, utiliser une pipette de secours mis en mode gravité en évitant le mélange des 70% et 30% des solutions. Une ligne très claire plate devraient être visibles à la jonction de -30% à 70%. Centrifuger 30 min à 18 ° C. 500G Assurez-vous centrifugeuse s&#39;arrête avec frein peu ou pas de telle sorte que l&#39;interphase n&#39;est pas perturbé. En utilisant une pipette de transfert, retirer délicatement la couche de débris provenant du haut du tube de 2,0 à 3,0 ml et recueillir de l&#39;interphase 70% -30% dans un tube propre coniques contenant 8 ml de 1X HBSS. S&#39;assurer que le Percoll contenant de l&#39;interphase est dilué environ trois fois, mélanger à quelques reprises par inversion et centrifugre 7 min à 500G à 18 ° C. Resuspendre le culot dans 1 ml de tampon de coloration des cellules et le transférer dans un tube de 1,5 ml et laver une fois de plus l&#39;aide d&#39;une micro-centrifugeuse à 10.000 G 1 min à 4 ° C. Coloration des anticorps Granulés Remettre en suspension dans 50 pl de purifier antisouris CD16/CD32 dilué 1:200 dans un tampon de coloration des cellules pour bloquer les sites Fc contraignant. Incuber sur la glace pendant 10 min. Compter les cellules en utilisant un hématimètre. Ajouter 50 ul de mélange de cocktail d&#39;anticorps et incuber sur de la glace pendant 30 min. Chaque anticorps doit d&#39;abord être titré pour évaluer la dilution optimale. Utiliser les combinaisons fluorochrome choisi selon les capacités du laser et des paramètres de filtre de votre cytomètre en flux particulier. Laver les cellules dans un tampon de coloration des cellules, des pastilles resuspendre dans 100-200 ul de tampon de coloration des cellules et d&#39;analyser immédiatement dans le cytomètre, ou bien les cellules peuvent être remises en suspension dans 2% de paraformaldéhyde (PFA) préparée dans du PBS et stockées pendant une nuit à 4 ° C . Les résultats représentatifs: Après filer les gradients, l&#39;interphase 70% -30% devrait avoir un halo blanc défini, et la quantification des cellules récupérées à partir d&#39;une souris naïve devrait donner 3-5 x10 5 cellules par souris (cerveau, plus de la moelle épinière). Enflammé du cerveau pourrait avoir un nombre allant de cellules inflammatoires en fonction de l&#39;insulte du SNC ou modèle de la maladie (figure 1). <img src="/files/ftp_upload/2348/2348fig1.jpg" alt="Figure 1" /> Figure 1. Isolement de cellules mononucléées, de naïf et EAE-cerveau à la maladie de pointe. Les cellules du cerveau suspensions ont été séparés plus discontinue de 70% / 30% des gradients de Percoll. Tachés cellules ont été incubées avec Fc-block suivi par des anticorps anti-CD45 pendant 30 min sur la glace. Les cellules ont été rincées dans un tampon de coloration des cellules, et fixé dans l&#39;acquisition de PFA 2% avant dans un LSR-II. CD45 intensité est mesurée dans l&#39;axe Y, où trois populations distinctes sont visualisés. Une caractérisation plus poussée du phénotype immunitaire des cellules CD45 Salut infiltrant est implémenté en utilisant des anticorps supplémentaires et ensuite analysés par cytométrie en flux.

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	<li>Sedgwick, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+and+direct+characterization+of+resident+microglial+cells+from+the+normal+and+inflamed+central+nervous+system.">Isolation and direct characterization of resident microglial cells from the normal and inflamed central nervous system.</a> Proceedings of the National Academy of Sciences of the United States of America. 88, 7438-7442 (1991).</li><li>Ponomarev, E. D., Shriver, L. P., Maresz, K., Dittel, B. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microglial+cell+activation+and+proliferation+precedes+the+onset+of+CNS+autoimmunity.">Microglial cell activation and proliferation precedes the onset of CNS autoimmunity.</a> J. Neurosci. Res. 81, 374-389 (2005).</li><li>Ford, A. L., Goodsall, A. L., Hickey, W. F., Sedgwick, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Normal+adult+ramified+microglia+separated+from+other+central+nervous+system+macrophages+by+flow+cytometric+sorting.+Phenotypic+differences+defined+and+direct+ex+vivo+antigen+presentation+to+myelin+basic+protein-reactive+CD4++T+cells+compared.">Normal adult ramified microglia separated from other central nervous system macrophages by flow cytometric sorting. Phenotypic differences defined and direct ex vivo antigen presentation to myelin basic protein-reactive CD4+ T cells compared.</a> J Immunol. 154, 4309-4321 (1995).</li><li>Cardona, A. E., Huang, D., Sasse, M. E., Ransohoff, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+of+murine+microglial+cells+for+RNA+analysis+or+flow+cytometry.">Isolation of murine microglial cells for RNA analysis or flow cytometry.</a> Nat. Protoc. 1, 1947-1951 (2006).</li><li>Juedes, A. E., Ruddle, N. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Resident+and+infiltrating+central+nervous+system+APCs+regulate+the+emergence+and+resolution+of+experimental+autoimmune+encephalomyelitis.">Resident and infiltrating central nervous system APCs regulate the emergence and resolution of experimental autoimmune encephalomyelitis.</a> J. Immunol. 166, 5168-5175 (2001).</li><li>Prinz, M., Priller, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tickets+to+the+brain:+Role+of+CCR2+and+CX(3)CR1+in+myeloid+cell+entry+in+the+CNS.">Tickets to the brain: Role of CCR2 and CX(3)CR1 in myeloid cell entry in the CNS.</a> J Neuroimmunol. , (2010).</li><li>Mildner, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microglia+in+the+adult+brain+arise+from+Ly-6ChiCCR2++monocytes+only+under+defined+host+conditions.">Microglia in the adult brain arise from Ly-6ChiCCR2+ monocytes only under defined host conditions.</a> Nat. Neurosci. 10, 1544-1553 (2007).</li><li>Djukic, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Circulating+monocytes+engraft+in+the+brain,+differentiate+into+microglia+and+contribute+to+the+pathology+following+meningitis+in+mice.">Circulating monocytes engraft in the brain, differentiate into microglia and contribute to the pathology following meningitis in mice.</a> Brain. 129, 2394-2403 (2006).</li></ol>

Les analyses des marqueurs de surface cellulaire dans les leucocytes dans les tissus du système nerveux central de souris normales et enflammée a été utilisé pendant plusieurs décennies 1-3. Protocoles d&#39;isolement sont basés dans la séparation de la microglie et des leucocytes par centrifugation 4 densité. Nous décrivons ici une méthode rapide et efficace d&#39;isoler les leucocytes SNC utilisant gradients de Percoll discontinu. Après isolement des cellules, la coloration avec des a...

Homogénéisation des tissus et Dégradés <ul><li> Percoll (Amersham) </li><li> 10X Hanks Balanced Salt Solution, sans calcium et magnésium (Gibco) </li><li> Milieu RPMI 1640 sans rouge de phénol (Gibco) </li><li> 7 ml ou 15 ml de tissus Dounce Meuleuses (VWR) </li></ul> La cytométrie en flux <ul><li> Tampon de coloration cellulaire (Biolegend) </li><li> Rat purifié anti-souris CD16/CD32 (Souris BD Fc Block), BD Pharmingen </li><li> Hémacytomètre (Fisher) </li><li> Anti-souris CD45 (clone 30-F11), CD4 (clone RM4-5), CD19 (clone 6D5), BioLegend </li><li> Phosphate 10X saline tamponnée, sans calcium ni magnésium (Thermo Scientific) </li><li> Paraformaldéhyde (Sigma Aldrich) </li><li> L&#39;analyse par cytométrie en flux effectuées avec un LSR II (BD Biosciences) </li></ul>

isolation of brain and spinal cord mononuclear cells using percoll gradients

Isolement des cellules du système immunitaire qui infiltrent le système nerveux central (SNC) lors d&#39;une infection, un traumatisme, une auto-immunité ou de la neurodégénérescence, est souvent nécessaire pour définir leur phénotype et les fonctions effectrices. Des approches histochimiques sont instrumentales pour déterminer l&#39;emplacement des cellules infiltrant et d&#39;analyser le système nerveux central pathologie associée. Cependant, in situ histochimie et techniques en immunofluorescence sont limitées par le nombre d&#39;anticorps qui peuvent être utilisés à un moment unique pour caractériser les sous-types de cellules immunitaires dans un tissu particulier. Par conséquent, les approches histologiques en conjonction avec le système immunitaire de phénotypage en cytométrie en flux sont essentielles pour caractériser complètement la composition de l&#39;infiltration du SNC locales. Ce protocole est basé sur la séparation des suspensions cellulaires du SNC au cours gradients de Percoll discontinu. Le présent article décrit un protocole rapide pour isoler efficacement les cellules mononucléées du tissus de la moelle épinière du cerveau et qui peuvent être utilisés efficacement pour l&#39;identification des différentes populations de cellules immunitaires dans un seul échantillon par cytométrie en flux.

Watch this Scientific Journal Video about Isolation of Brain and Spinal Cord Mononuclear Cells Using Percoll Gradients at JoVE.com

Isolation of Brain and Spinal Cord Mononuclear Cells Using Percoll Gradients

Le présent article décrit un protocole rapide pour isoler efficacement les cellules mononucléées du tissus de la moelle épinière du cerveau et qui peuvent être utilisés efficacement pour des analyses de cytométrie en flux.

Isolement du cerveau et les cellules mononucléées de la moelle épinière utilisant gradients de Percoll

Isolation of immune cells that infiltrate the central nervous system (CNS) during infection, trauma, autoimmunity or neurodegeneration, is often required ...

isolation-brain-spinal-cord-mononuclear-cells-using-percoll

Research

JoVE Journal

Immunology and Infection

40.5K vues.  University of Texas at San Antonio - UTSA. Le présent article décrit un protocole rapide pour isoler efficacement les cellules mononucléées du tissus de la moelle épinière du cerveau et qui peuvent être utilisés efficacement pour des analyses de cytométrie en flux.

Vidéo: Isolation of Brain and Spinal Cord Mononuclear Cells Using Percoll Gradients

Quantitative Assessment of Immune Cells in the Injured Spinal Cord Tissue by Flow Cytometry:  a Novel Use for a Cell Purification Method

Detection of immune cells in the injured central nervous system (CNS) using morphological or histological techniques has not always provided true quantitative analysis of cellular inflammation. Flow cytometry is a quick alternative method to quantify immune cells in the injured brain or spinal cord tissue. Historically, flow cytometry has been used to quantify immune cells collected from blood or dissociated spleen or thymus, and only a few studies have attempted to quantify immune cells in the injured spinal cord by flow cytometry using fresh dissociated cord tissue. However, the dissociated spinal cord tissue is concentrated with myelin debris that can be mistaken for cells and reduce cell count reliability obtained by the flow cytometer. We have advanced a cell preparation method using the OptiPrep gradient system to effectively separate lipid/myelin debris from cells, providing sensitive and reliable quantifications of cellular inflammation in the injured spinal cord by flow cytometry. As described in our recent study (Beck &amp; Nguyen et al., Brain. 2010 Feb; 133 (Pt 2): 433-47), the OptiPrep cell preparation had increased sensitivity to detect cellular inflammation in the injured spinal cord, with counts of specific cell types correlating with injury severity. Critically, novel usage of this method provided the first characterization of acute and chronic cellular inflammation after SCI to include a complete time course for polymorphonuclear leukocytes (PMNs, neutrophils), macrophages/microglia, and T-cells over a period ranging from 2 hours to 180 days post-injury (dpi), identifying a surprising novel second phase of cellular inflammation. Thorough characterization of cellular inflammation using this method may provide a better understanding of neuroinflammation in the injured CNS, and reveal an important multiphasic component of neuroinflammation that may be critical for the design and implementation of rational therapeutic treatment strategies, including both cell-based and pharmacological interventions for SCI.

Quantification of cellular inflammation in the injured/pathological CNS by flow cytometry is complicated by lipid/myelin debris that can have similar size and granulation to cells, decreasing sensitivity/accuracy. We have advanced a cell preparation method to remove myelin debris and improve cell detection by flow cytometry in the injured spinal cord.

Évaluation quantitative des cellules immunitaires dans le tissu blessés médullaires par cytométrie en flux: une nouvelle utilisation pour un procédé de purification cellulaire

Detection of immune cells in the injured central nervous system (CNS) using morphological or histological techniques has not always provided true ...

Recherche

Immunologie et infection

Isolation of Brain-infiltrating Leukocytes

We describe a method for preparing brain infiltrating leukocytes (BILs) from mice. We demonstrate how to infect mice with Theiler's murine encephalomyelitis virus (TMEV) via a rapid intracranial injection technique and how to purify a leukocyte-enriched population of infiltrating cells from whole brain. Briefly, mice are anesthetized with isoflurane in a closed chamber and are free-hand injected with a Hamilton syringe into the frontal cortex. Mice are then killed at various times after infection by isoflurane overdose and whole brains are extracted and homogenized in RPMI with a Tenbroeck tissue grinder. Brain homogenates are centrifuged through a continuous 30% Percoll gradient to remove the myelin and other cell debris. The cell suspension is then strained at 40 &mu;m, washed and centrifuged on a discontinuous Ficoll-Paque Plus gradient to select and purify the leukocytes. The leukocytes are then washed and resuspended in appropriate buffers for immunophenotyping by flow cytometry. Flow cytometry reveals a population of innate immune cells at the early stages of infection in C57BL/6 mice. At 24 hours post infection, multiple subsets of immune cells are present in the BILs, with an enriched population of Gr1+, CD11b+ and F4/80+cells. Therefore, this method is useful in characterizing the immune response to acute infection in the brain.

A rapid method to obtain infiltrating leukocytes from the murine brain is described. This method utilizes a continuous Percoll gradient and discontinuous Ficoll gradient to select and purify the leukocyte-enriched layer. Isolated leukocytes may then be characterized by flow cytometric measurements.

Isolement du cerveau infiltrant Leucocytes

We describe a method for preparing brain infiltrating leukocytes (BILs) from mice. We demonstrate how to infect mice with Theiler's murine ...

Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus

In this protocol we provide a method to isolate dendritic cells (DC) and epithelial cells (TEC) from the human thymus. DC and TEC are the major antigen presenting cell (APC) types found in a normal thymus and it is well established that they play distinct roles during thymic selection. These cells are localized in distinct microenvironments in the thymus and each APC type makes up only a minor population of cells. To further understand the biology of these cell types, characterization of these cell populations is highly desirable but due to their low frequency, isolation of any of these cell types requires an efficient and reproducible procedure. This protocol details a method to obtain cells suitable for characterization of diverse cellular properties. Thymic tissue is mechanically disrupted and after different steps of enzymatic digestion, the resulting cell suspension is enriched using a Percoll density centrifugation step. For isolation of myeloid DC (CD11c+), cells from the low-density fraction (LDF) are immunoselected by magnetic cell sorting. Enrichment of TEC populations (mTEC, cTEC) is achieved by depletion of hematopoietic (CD45hi) cells from the low-density Percoll cell fraction allowing their subsequent isolation via fluorescence activated cell sorting (FACS) using specific cell markers. The isolated cells can be used for different downstream applications.

This protocol details a method to isolate antigen presenting cells from human thymus via different steps of enzymatic digestion of the tissue followed by density centrifugation of the single cell suspension and finally magnetic and/or FACS sorting of the cell populations of interest.

Isolement des cellules dendritiques myéloïdes et les cellules épithéliales du thymus humain

In this protocol we provide a method to isolate dendritic cells (DC) and epithelial cells (TEC) from the human thymus. DC and TEC are the major antigen ...

Isolation and Flow Cytometric Analysis of Glioma-infiltrating Peripheral Blood Mononuclear Cells

Our laboratory has recently demonstrated that natural killer (NK) cells are capable of eradicating orthotopically implanted mouse GL26 and rat CNS-1 malignant gliomas soon after intracranial engraftment if the cancer cells are rendered deficient in their expression of the &#946;-galactoside-binding lectin galectin-1 (gal-1). More recent work now shows that a population of Gr-1+/CD11b+ myeloid cells is critical to this effect. To better understand the mechanisms by which NK and myeloid cells cooperate to confer gal-1-deficient tumor rejection we have developed a comprehensive protocol for the isolation and analysis of glioma-infiltrating peripheral blood mononuclear cells (PBMC). The method is demonstrated here by comparing PBMC infiltration into the tumor microenvironment of gal-1-expressing GL26 gliomas with those rendered gal-1-deficient via shRNA knockdown. The protocol begins with a description of&#160;how to culture and prepare GL26 cells for inoculation into the syngeneic C57BL/6J mouse brain. It then explains the steps involved in the isolation and flow cytometric analysis of glioma-infiltrating PBMCs from the early brain tumor microenvironment. The method is adaptable to a number of in vivo experimental designs in which temporal data on immune infiltration into the brain is required. The method is sensitive and highly reproducible, as glioma-infiltrating PBMCs can be isolated from intracranial tumors as soon as 24 hr post-tumor engraftment with similar cell counts observed from time point matched tumors throughout independent experiments. A single experimentalist can perform the method from brain harvesting to flow cytometric analysis of glioma-infiltrating PBMCs in roughly 4-6 hr depending on the number of samples to be analyzed. Alternative glioma models and/or cell-specific detection antibodies may also be used at the experimentalists&#8217; discretion to assess the infiltration of several other immune cell types of interest without the need for alterations to the overall procedure.

Presented here is a straightforward method for the isolation and flow cytometric analysis of glioma-infiltrating peripheral blood mononuclear cells that yields time-dependent quantitative data on the number and activation status of immune cells entering the early brain tumor microenvironment.

L&#39;isolement et la cytométrie en flux analyse des cellules mononucléaires du sang périphérique gliome infiltrant

Our laboratory has recently demonstrated that natural killer (NK) cells are capable of eradicating orthotopically implanted mouse GL26 and rat CNS-1 ...

Isolation of Lamina Propria Mononuclear Cells from Murine Colon Using Collagenase E

The intestine is the home to the largest number of immune cells in the body. The small and large intestinal immune systems police exposure to exogenous antigens and modulate responses to potent microbially derived immune stimuli. For this reason, the intestine is a major target site of immune dysregulation and inflammation in many diseases including but, not limited to inflammatory bowel diseases such as Crohn&#8217;s disease and ulcerative colitis, graft-versus-host disease (GVHD) after bone marrow transplantation (BMT), and many allergic and infectious conditions. Murine models of gastrointestinal inflammation and colitis are heavily used to study GI complications and to pre-clinically optimize strategies for prevention and treatment. Data gleaned from these models via isolation and phenotypic analysis of immune cells from the intestine is critical to further immune understanding that can be applied to ameliorate gastrointestinal and systemic inflammatory disorders. This report describes a highly effective protocol for the isolation of mononuclear cells (MNC) from the colon using a mixed silica-based density gradient interface. This method reproducibly isolates a significant number of viable leukocytes while minimizing contaminating debris, allowing subsequent immune phenotyping by flow cytometry or other methods.

The goal of this protocol is to isolate mononuclear cells that reside in the lamina propria of the colon by enzymatic digestion of the tissue using collagenase. This protocol allows for the efficient isolation of mononuclear cells resulting in a single cell suspension which in turn can be used for robust immunophenotyping.

Isolement des cellules mononucléaires Lamina Propria du colon murine à l'aide de la collagène E

The intestine is the home to the largest number of immune cells in the body. The small and large intestinal immune systems police exposure to exogenous ...

Isolation of Tonsillar Mononuclear Cells to Study Ex Vivo Innate Immune Responses in a Human Mucosal Lymphoid Tissue

Studying isolated cells from mucosa-associated lymphoid tissues (MALT) allows understanding of immune cells response in pathologies involving mucosal immunity, because they can model host-pathogen interactions in the tissue. While isolated cells derived from tissues were the first cell culture model, their use has been neglected because tissue can be hard to obtain. In the present protocol, we explain how to easily process and culture tonsillar mononuclear cells (TMCs) from healthy human tonsils to study innate immune responses upon activation, mimicking viral infection in mucosal tissues. Isolation of TMCs from the tonsils is quick, because the tonsils barely have any epithelium and yield up to billions of all major immune cell types. This method allows detection of cytokine production using several techniques, including immunoassays, qPCR, microscopy, flow cytometry, etc., similar to the use of peripheral mononuclear cells (PBMCs) from blood. Furthermore, TMCs show a higher sensitivity to drug testing than PBMCs, which needs to be considered for future toxicity assays. Thus, ex vivo TMCs cultures are an easy and accessible mucosal model.

In the present protocol, we explain how to easily process and culture tonsillar mononuclear cells from healthy humans undergoing partial surgical tonsillectomy to study innate immune responses upon activation, mimicking viral infection in mucosal tissues.

Isolement des cellules monnucléaires tonsillar pour étudier les réponses immunitaires innées Ex Vivo dans un tissu lymphoïde muqueuse humain

Studying isolated cells from mucosa-associated lymphoid tissues (MALT) allows understanding of immune cells response in pathologies involving mucosal ...

Flotation-Based T Cell Isolation, Activation, and Expansion from Human Peripheral Blood Mononuclear Cell Samples Using Microbubbles

The process of isolating T cells from peripheral blood mononuclear&#160;cells (PBMCs) to establish ex vivo cultures is crucial for research, clinical testing, and cell-based therapies. In this study, a simple, novel protocol to isolate, activate, and expand T cells from PBMCs ex vivo is presented. This study utilizes functionalized buoyancy-activated cell sorting (BACS) technology to isolate and activate T cells. Briefly, the protocol involves the positive selection of CD3+ cells from leukopak-derived PBMCs, followed by a 48 h co-stimulation with pre-conjugated anti-CD28-bound streptavidin microbubbles (SAMBs) prior to transduction in 24-well plates. Functionalized microbubbles offer a unique opportunity to buoyantly activate cells, leading to proliferative phenotypes that allow for expansion with minimal exhaustion. This technique offers reduced exhaustion because the co-stimulatory microbubbles remain buoyant and return to the top of the culture medium, thus reducing the amount of time that the expanding cells are in contact with the co-stimulatory factors. The results indicate that the isolated and cultured T cells receive enough stimulation to activate and proliferate but not to an extent that leads to overactivation, which then leads to exhaustion, as demonstrated by the presence of excessive PD-1.

The objective of this study is to demonstrate the feasibility of flotation-based separation to isolate, activate, and expand primary human T cells.

Isolement, activation et expansion des lymphocytes T par flottation à partir d’échantillons de cellules mononucléaires du sang périphérique humain à l’aide de microbulles

The process of isolating T cells from peripheral blood mononuclear&#160;cells (PBMCs) to establish ex vivo cultures is crucial for research, clinical ...

Collection et cryostockage PBMC pour l’analyse bioénergétique mitochondriale

Cryopreservation and Bioenergetic Evaluation of Human Peripheral Blood Mononuclear Cells

The physiological functions of eukaryotic cells rely on energy mainly provided by mitochondria. Mitochondrial dysfunction is linked to metabolic diseases and aging. Oxidative phosphorylation plays a decisive role, as it is crucial for the maintenance of energetic homeostasis. PBMCs have been identified as a minimally invasive sample to measure mitochondrial function and have been shown to reflect disease conditions. However, measurement of mitochondrial bioenergetic function can be limited by several factors in human samples. Limitations are the amount of samples taken, sampling time, which is often spread over several days, and locations. Cryopreservation of the collected samples can ensure consistent collection and measurement of samples. Care should be taken to ensure that the parameters measured are comparable between cryopreserved and freshly prepared cells. Here, we describe methods for isolating and cryopreserving PBMCs from human blood samples to analyze the bioenergetic function of the mitochondria in these cells. PBMC cryopreserved according to the protocol described here show only minor differences in cell number and viability, adenosine triphosphate levels, and measured respiratory chain activity compared with freshly harvested cells. Only 8-24 mL of human blood is needed for the described preparations, making it possible to collect samples during clinical studies multicentrally and determine their bioenergetics on site.

Pleins feux sur l’auteur : Préservation des paramètres bioénergétiques dans les cellules mononucléées du sang périphérique après cryoconservation 

Isolated peripheral blood mononuclear cells can be used for the analysis of immune functions and disorders, metabolic diseases, or mitochondrial functions. In this work, we describe a standardized method for the preparation of PBMCs from whole blood and the subsequent cryopreservation. Cryopreservation makes this time and place independent.

Cryoconservation et évaluation bioénergétique des cellules mononucléées du sang périphérique humain

The physiological functions of eukaryotic cells rely on energy mainly provided by mitochondria. Mitochondrial dysfunction is linked to metabolic diseases ...